Abstract
In this study, the evolution of the mechanical properties of Fe–30Mn–9Al–1C steel has been determined in tensile tests at strain rates of 10−4 to 102 s−1. The results show that the strain rate sensitivity becomes a negative value when the strain rate exceeds 100 s−1 and this abnormal evolution is attributed to the occurrence of dynamic strain aging. Due to the presence of intergranular κ-carbides, the fracture modes of steel include ductile fracture and intergranular fracture. The values of dislocation arrangement parameter M were obtained using a modified Williamson–Hall plot. It has been found that once the strain rate sensitivity becomes negative, the interaction of dislocations in the steel is weakened and the free movement of dislocation is enhanced. Adiabatic heating promotes the dynamic recovery of steel at a high strain rate.
Highlights
High Mn–high Al steel generally refers to a class of steel with an Mn content of 15–35 wt%, Al content of 5–12 wt %, and stacking fault energy (SFE) of more than 80 mJ·m−2 [1]
It has been proved that the addition of Al could suppress Dynamic strain aging (DSA) so that the strain rate has to be increased to motivate this effect [15]
The strain rate sensitivity coefficient of Fe–30Mn–9Al–1C steel was estimated to be negative in the strain rate range of 100 –102 s−1
Summary
High Mn–high Al steel generally refers to a class of steel with an Mn content of 15–35 wt%, Al content of 5–12 wt %, and stacking fault energy (SFE) of more than 80 mJ·m−2 [1]. High Mn–high Al steel generally refers to a class of steel with an Mn content of 15–35 wt. The mechanical properties of steel depend on the strain rate in a tensile or compression test. This is because, firstly, the motion of dislocations is controlled by different mechanisms at different strain rates, and secondly, some additional deformation mechanisms, such as twinning or phase transformation, may occur at a high strain rate [3,4]. Most works have operated tests at a low strain rate to investigate the mechanical properties of high Mn–high Al steel [5,6,7]. It is important to clarify the evolution of the mechanical properties of high
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